This study aimed to analyze the difference between the measurements made according to certain anatomical signs of the maxillary jaw using panoramic radiography and CBCT to decide whether to use all-on-4, M-4, or V-4 configuration to prevent complications caused by incorrect measurements during the pre-surgical planning stage of the placement of implants in the all-on-4 technique.
A retrospective study was conducted with 50 patients with upper edentulous jaws suitable for the all-on-4 technique, who underwent preoperative panoramic radiography and CBCT evaluation for dental implant surgery. The shortest vertical distances between anatomical structures were measured. Measurements were made independently by two oral and maxillofacial surgeons, one experienced and the other inexperienced.
A statistically significant difference was found between the mean values according to gender (p = 0,045). When the measurements made by the experienced surgeon and the inexperienced surgeon were compared, there was no significant difference between panoramic radiography and CBCT. In situations where bone measurements are required for deciding on all-on-4 or one of its configurations (M-4 and V-4), it was found that panoramic radiography gives significantly incorrect results compared to CBCT (p < 0.05).
CBCT is more reliable than panoramic radiography and eliminates the margin of error in the planning of all-on-4 or its variations to be made by either an experienced or an inexperienced oral surgeon.